Knife-blade switch.



E'. 5. MMM. KNIFE 'BLADE swicH. APPLICATION HLED APILZQ' i918.

BQQQBSQLL Emma Apr. 8,1919

i c Y FBEDRICK IB. ADAM, OF ST. LG'US, MISSOUR, ASSGNQR T FRANK-A-Dvl ELECTRIC COMPANY, ,0F S'I LOUIS, MSSOURI, A CDREORATIN O3? MISSOURI.

KNIFE-BLADE SWITGH.

f Specification of Letters Patent.

Patented Apr. 8, i919.

-Application filed April 29, 191%. Serial No. 231,370.

. Switches, of which the following is` a full,

clear, and exact description, such as will enable other-s skilled in the art to which it ap- 'perta-insvto make and use the saire.

This invention relates to knife bla-de switches, and has for its main object to pro- .vide a. knife blade switch that can be manufactured at a low cost, that is strong and substantial andwhich presents a neat and inished appearance. Another object iS to provide a novel method ot' making a knife blade switch. l

To this end I have devised a knife blade switch in which the blade is'connected'to the cross bar or handle by a screw, bolt or similar fastening device t at istapped into an integral socket in the handle end 'ci the ADAM a:

blade formed by laterally-expanded portions f ofthe blade. method of making said switch which iscliaracterized by forcing a punch into the end of the blade and expanding the metal in the.

blade laterally intermediate the edges oi' the one form of my invention; and

Fig. l is a perspective View, illustrating another form of my invention.

Referring to the drawingaA designates the blades of my improved switch which .are

Fig. 3 is a perspective view, illustrating' I have also devised a novel ther end of the blade and expavndinji the' metal in the blade laterally into a die in which the end portion of the blade is confined, thereby producing a longitudinally* disposed socket in the end portion of the blade Whose side walls `project laterally from the blade, vthe side Walls of said socket 8 loeing or about onedialf the-thickness of the blade, as shone in Fig. 3. 9

After the :l in the end portion of the blade has beer expanded laterally in the manner above described to form the socket 3, a tap is run into saidsocket so as to form screw threads i3 on'the interior of same to receive the reads on the' screw 2. llhe cross bar ld i provided with a transverselydisposed ove 4 that receives .the .end portion of 'l clade A, and said roove is provided intermediate its ends wit. an enlarged portion that receives the end portion of the sachet 3 on the blade.

vifi/hide I prefer to have the end of the socket 3 terminate ilush with the end of thel blade, as shown in Fig. 3, this is not essenwhose end terminates sonnedistance inwardly fromA the end of the blade. When the blade is formed in the manner shown in the manner to the cross bar or connected in any preferred manner to hinge standards l, and B designates the cross bar connected. In a single pole switch the blade is connected directly to the handle' instead of to a cross bar. The cross bar B is oon.-

, nected to the blades A by screws 2 that pass through the cross bar an'd are screwed into internally scrcw-thrI ded integral sockets 3 on the blades, each blade being connected to the cross bar by a separatescrcw.

The socket 3 on. eachblade is ornled by forcing; a pencher other suitable device into Fig, i the cross bar B vis merely provided with a transversely-disposed slot l14 into which the projecting end portion of the blade extends, the end of the socket 13 batting againstdthe flat underside ci the cross bar.

By constructing a knife blade switch in above described I am able to manufacture the switch at avery low cost,

: owing to the fact that the blade is connected handle by a screw which -i's screwed directly inte the end of the blade a nut or separate part cai-- instead of into ried by the blade, the portion of theblade 'that receives said screw being formed by ex-.

pending the rhetal in the end portion'ot the blade laterally by means of a punch that 1s forced into the end of the blade, so as to divide the metal and torce it `laterally in oppositeY directions at a point intermediate the edges of the blade.v No upsetting opera tion is required to increase the thickness of the end portion of the blade, nor is it necessary to use a .longer blade or a thicker blade thanthe blade or" a standard knife switch.

son

ico

While the side walls of the socket 3 are approximately only one-half the thickness of the blade, nevertheless, said socket ntains suiiicient metal to insure' a strong and substantial fastening means-for the screw 2. The vend of the -blade isset into thecross bar, or into the handle, in the case of a sin-- glepole switch, in such a manner that it is impossible for the 'blade to twist or turn relatively tothe cross bar, consequently, the

only work `the screw 2 has to do is to prevent the blade from pulling away from the cross bar. The socket on the blade is so small and compact that the switch presents a neat'and finished appearance, and another desirable feature that results from connecting the blade and the cross bar together in I cla11n,and desire to secure by Letters Patent, is s 1. AV knife blade switch, .comprising a y blade provided at its handle end with laterally-expanded portions that extend longitudinally of the blade intermediate the edges of the blade,I a cross bar or handle, and a screw lor similar device extending through the cross bar or handle and tapped into said laterally-expanded portions.

2. A knife blade switch, comprising a vblade providedat its handle end with a longitudinally-disposed socket whose diamf eter is greaterhan the thickness ofthe '40 blade and whose side walls consist of laterally-expanded portions ofthe blade which are substantially one-haltl the thickness of the metal in the blade, a. cross bar or handlev provided with a's'lot for receiving the end portion of theblade, and a screw-threaded connecting device for said elements -tapped into the socket in said blade.

3. A knife blade switch, comprising a blade provided at its handle end-with laterallyexpanded portions that extend longitudinally of the blade intermediate the edges of the blade andlwhose outer ends terminate some distance inwardly from the end of the blade, a crossbar or handle butting against the ends of said laterally-expanded portions and-provided with a slot for receivlng the end portion of the blade,

and a screw or similar device extending through the cross bar or handle andftapped into 'the laterally-expanded portions of the blade.

4. A method of making knife blade switch, characterized by dividing the metal in the handle end of the 4blade and expand I ing it laterally in opposite directions at a point intermediate* the ,edges of the blade so vas to form a longitudinally-disposed socket in the end of the blade, forin'ng screw vice that is screwed into said Socket,

5.- A method of making a knife blade threads in said socket, and thereafter con- Av necting across bar or. handle-to the blade by means" of a screw or other suitable deswitch, characterizedby arranging the han. l

dle end of. the switch blade in a die, forcing a punch or other suitable device into the end v of the blade so as to expand the metl in thel blade laterally into said die, thereby producing a longitudinally-disposed socket in the end of the blade whose side walls are approximately one-half the thickness of the metal in the blade, running a tap into. said, t

socket so as to form screw threadshon` the interior of same, arranging the endportion of the blade into a slot in a cross bar or handle, and connectingI said cross bar `or handle to the bla. e by means of a screw`or similar socket in the blade.

FEDRICK B; ADAM.

device that is screwed into the 

